What I have read, multiple flushes and oil changes return it to a reasonable state. I certainly wouldn't want to drive a car where the transmission judders.
As an aside, the noisy manual gearbox will run forever. It just gets noisier and, in my case, got so embarrassing I had it repaired. A transmission specialist charged me £324 to do the job. I drove the car in one day and picked it up the next.